1.1.1. Structure of a PTM

The main features of a PTM are:

Trace generation

Outputs
information that helps you to understand the operation of the processor.
The trace protocol provides a real-time trace capability for processors
that are deeply embedded in much larger ASIC designs.

Note

You cannot determine how the processor is operating internally
by observing the pins of the ASIC, because the ASIC typically includes
significant amounts of on-chip memory.

Triggering and filtering facilities

The PFT architecture specification defines a range
of triggering and filtering resources that can be used to control
tracing. For a number of these, it is implementation
defined:

whether
a PTM implementation includes the resource

how many instances of the resource are included.

If you are designing a PTM you can specify the exact set of
triggering and filtering resources required by your particular application.